The original owner put their name on the tool deep enough so Sir Lightfinger would not be able to sneak that wrench home in his pants leg and buff the name off....
Don't blame the original owner one bit, as I do the same.... I like to buy my tools once, and the engravings have enabled me to retrieve tools from Sir Lightfinger more than once.. People say that the engravings hurt the resale.. Yes, Yes, and,,, Yes....But My tools were not bought for resale... So I am money ahead because I have had to buy very few tools Twice.. Because they were Deeply stamped or engraved with my name... Being that I do not want tools in my procession with someone else's name on them, I would not have bought the wrenches in the op.. Grinding on those wrenches would look hackish, so your best route would be to leave them as is if you keep them..
If you have a purchase receipt for those wrenches; I would keep it for safe keeping.. It would be a real bummer if You bought those wrenches from Sir Lightfinger, and the Police were looking for them..??